Makisu is like a big mat that is used in a special way to help make sushi. Imagine spreading out a big blanket made of bamboo sticks. The sticks are lined up so that they are close together, but not too close. Then, sushi rice and other ingredients are placed on top of the mat in a line. The mat is then rolled up tightly, squeezing the rice and ingredients together into a roll. This roll is then cut into smaller pieces which can be eaten as sushi! Makisu is an important tool used by sushi chefs to make delicious sushi rolls.